I did a much needed mini tune up. My car was doing about 360 miles per tank (no joke). I changed my oil, spark plugs and seal, fuel fillter, and recharged my K&n air filter. And now im barely @ half a tank im im only @ about 120 miles!!! Anyone know the problem? Or is this normal.

And also, any write up on oil pan gasket change? It seems simple but the bolts are very hidden, under pipes and stuff.

 

360 miles per tank on an Integra is VERY, VERY good. Are you sure it needed a tune-up?

Driving conditions, weather, length of trips, and amount of lead foot all have an impact on fuel economy. Don't base your conclusions just on this first tank of gas after your tune-up. You need to average out several tanks to see how it's doing.

Also, corrected spelling error in thread title for future search purposes.

 

Hows your o2 sensor, maybe its time to change that too?

 

Try calculating your mileage based on miles per gallon rather than miles per tank, to eliminate any differences due to how much gas you put in the tank. And, as Patrick notes, total your miles and gallons over several tankfuls to get a more accurate average (assuming they all have the same mix of city vs highway driving).